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r4619

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git-svn-id: svn://kolibrios.org@4619 a494cfbc-eb01-0410-851d-a64ba20cac60
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CleverMouse 2014-03-07 10:57:58 +00:00
parent e81e5dc921
commit 43101a8623
1 changed files with 5 additions and 2 deletions
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7
kernel/trunk/core/mtrr.inc
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@ -821,8 +821,11 @@ endp
; Let's hope he would report it to developers...
proc mtrr_validate
; 1. If MTRRs are not supported, they cannot be configured improperly.
bt [cpu_caps], CAPS_MTRR
jnc .exit
; Note: VirtualBox claims MTRR support in cpuid, but emulates MTRRCAP=0,
; which is efficiently equivalent to absent MTRRs.
; So check [num_variable_mtrrs] instead of CAPS_MTRR in [cpu_caps].
cmp [num_variable_mtrrs], 0
jz .exit
; 2. If variable-range MTRRs are not configured, this is a problem.
mov ecx, 0x2FF
rdmsr